Update Muon to 4.5.38

[bsclifton]

Test plan

1. Launch Brave and open about:brave
2. Muon version should be 4.5.38

Description

4.5.37 Muon changes were required for:

• Brave fills in some password on sites, even though I explicitly turned off password management. Brave fills in some password on sites, even though I explicitly turned off password management. #10566
• Trezor passphrase being saved to password list and offered by auto fill without permission. Trezor passphrase being saved to password list and offered by auto fill without permission. #12563

4.5.38 Muon changes were required for:

• Muted Media should be able to autoplay revert muted media should be able to autoplay #12152
• nytimes.com is incorrectly allowed to autoplay media nytimes.com is incorrectly allowed to autoplay media #12600

[bsclifton]

Updated to 4.5.37 with d9c303f

[bsclifton]

Re-opening since we'll need a new build (in progress) 😄

[bsclifton]

Fixed with ba3906a

[srirambv]